JP3785009B2 - Continuous heating furnace for activation treatment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a continuous heating furnace for activation treatment in which an object to be processed made of a carbonaceous material containing a volatile substance is heated in a steam atmosphere.
[0002]
[Prior art]
As this type of continuous heating furnace, the object to be processed is carried into a heating chamber through an inlet purge chamber by a transfer device, and volatile substances are evaporated by heat treatment in a steam atmosphere at 500 to 1000 ° C. After that, there is known one that is transferred to a cooling chamber by the transfer device, cooled, and carried out of the furnace through an outlet purge chamber.
In such a continuous heating furnace for activation treatment, volatile components are discharged into the furnace from volatile substances such as tar and pitch contained in the carbonaceous material, and the discharged volatile substances are introduced outside the furnace. It is burned and discarded.
[0003]
[Problems to be solved by the invention]
The conventional continuous heating furnace for activation treatment needs to always supply a purge gas such as nitrogen gas to the inlet purge chamber and the outlet purge chamber during use. For this reason, there is a problem that a large amount of purge gas is consumed and the processing cost is high. In addition, there is a problem in that if the gas generated when the material volatilized from the object to be burned is released to the atmosphere as it is, it becomes an environmental burden.
[0004]
In view of the conventional problems as described above, the present invention can eliminate the need for the conventional purge gas supplied to the purge chamber, and circulate and reuse the gas generated by the combustion of the volatilized substance as the purge gas. Accordingly, an object of the present invention is to provide a continuous heating furnace for activation treatment that can reduce the environmental load.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the continuous heating furnace for activation treatment according to the present invention includes a heating chamber for heating an object to be processed made of a carbonaceous material containing a volatile substance in a steam atmosphere, and an object to be processed heated in the heating chamber. A cooling chamber for cooling the object, an inlet purge chamber provided on the workpiece carry-in side of the heating chamber, an outlet purge chamber provided on the workpiece discharge side of the cooling chamber, and the workpiece In the continuous heating furnace for activation treatment, comprising a transfer device that sequentially transfers to the inlet purge chamber, heating chamber, cooling chamber, and outlet purge chamber, a recovery device that recovers the material volatilized from the workpiece from the heating chamber to the outside of the furnace And a combustion device for combusting the recovered volatile substances, and a gas supply device for supplying the gas generated in the combustion device to the inlet purge chamber and the outlet purge chamber, and directly discarding the gas generated in the combustion device to the atmosphere Purge without And wherein the circulating re-use as a nest.
The continuous heating furnace for activation treatment configured in this way recovers the material volatilized from the object to be processed in the heating chamber by the recovery device, burns the recovered volatile material by the combustion device, and generates it in the combustion device. The gas to be supplied can be supplied to the inlet purge chamber and the outlet purge chamber as a purge gas by the gas supply device, so that the gas generated in the combustion device can be circulated and reused as the purge gas without being directly discarded to the atmosphere. it can.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic diagram showing an embodiment of a continuous heating furnace for activation treatment according to the present invention. This continuous heating furnace includes a furnace body 1 that heats and cools an object to be processed containing a volatile substance, a transfer device 2 that includes a net conveyor that passes through the inside of the furnace body 1, and a substance ( (Hereinafter referred to as “volatile substances”) from the furnace to the outside of the furnace for recovery, a recovery apparatus 3 for combusting the recovered volatile substances, and a gas generated by the combustion of the volatile substances as a purge gas A main part is constituted by the gas supply device 5 supplied from the combustion device 4 to the furnace body 1.
[0007]
Referring also to FIG. 2, the furnace body 1 is adjacent to the heating chamber 11 for heating the workpiece, the cooling chamber 12 for cooling the workpiece heated in the heating chamber 11, and the heating chamber 11. An inlet purge chamber 13 provided on the workpiece carry-in side and an outlet purge chamber 14 provided on the workpiece carry-out side adjacent to the cooling chamber 12 are provided.
[0008]
The heating chamber 11 heats the workpiece carried from the inlet purge chamber 13 by the transport device 2 to a temperature of 500 to 1000 ° C. in a steam atmosphere, and activates the workpiece. The periphery of the heating chamber 11 is covered with a heat insulating wall 11a, and steam pipes 11b having a large number of injection nozzles are arranged at upper and lower positions sandwiching the transport surface of the transport device 2. In addition, an atmosphere recovery port 11c is provided in the ceiling portion of the heating chamber 11 near the inlet purge chamber 13, and the boundary between the heating chamber 11 and the inlet purge chamber 13, and the heating chamber 11 and the cooling chamber 12, A partition wall 11d is provided at a boundary portion of the transfer device 2 in a state in which the transfer device 2 and the workpiece placed thereon are allowed to pass.
[0009]
The cooling chamber 12 is composed of a slow cooling region 12a following the heating chamber 11, and an external water cooling region 12b having a double structure following the heating chamber 11, and a water cooling jacket 12c is disposed in the external water cooling region 12b so as to surround the conveyance space. In addition, by circulating and supplying cooling water from the outside of the furnace to the water-cooled jacket 12c, it is possible to cool the workpiece carried in from the heating chamber 11.
In addition, a partition wall 12d is provided at the boundary between the cooling chamber 12 and the outlet purge chamber 14 in a state in which passage of the transfer device 2 and an object to be processed placed thereon is permitted.
[0010]
The inlet purge chamber 13 is for sealing the atmosphere of the heating chamber 11, and the gas generated in the combustion device 4 is supplied to the inside via the gas supply device 5. Further, on the carry-in side of the workpiece in the inlet purge chamber 13, an opening 13a that allows passage of the workpiece 2 and the workpiece placed thereon is provided, and an atmosphere recovery is provided on the ceiling portion. A mouth 13b is provided.
The outlet purge chamber 14 is for sealing the atmosphere of the cooling chamber 12, and the gas generated in the combustion device 4 is supplied to the inside through the gas supply device 5. In addition, on the side of the outlet purge chamber 14 where the object to be processed is carried out, there is provided an opening 14a that allows the conveying device 2 and the object to be processed placed thereon to pass through, and an atmosphere recovery is provided on the ceiling. A mouth 14b is provided.
[0011]
The transfer device 2 rotates endlessly with the transfer surface side inserted through the furnace body 1, and continuously transfers the object to be processed from the inlet purge chamber 13 toward the outlet purge chamber 14.
The recovery device 3 communicates the atmosphere recovery ports 11 c, 13 b, 14 b of the heating chamber 11, the inlet purge chamber 13 and the outlet purge chamber 14 with the combustion chamber 41 of the combustion device 4 through a pipe 31. A pair of traps 32 and 33 and an intake blower 34 are interposed in the section. The traps 32 and 33 are water-cooled, one trap 32 captures tar and moisture contained in the atmospheric gas discharged from the heating chamber 11 and the inlet purge chamber 13, and the other trap 32 is the outlet purge chamber. 14 captures the tar and moisture contained in the atmospheric gas discharged from 14.
[0012]
The combustion device 4 burns the volatile substance recovered in the combustion chamber 41 by the recovery device 3 by the burner 42, and a gas containing carbon dioxide, nitrogen and water vapor is generated along with the combustion, and the gas Is guided to the gas supply device 5 through an outlet 43 provided in the ceiling of the combustion chamber 41.
[0013]
The gas supply device 5 communicates the take-out port 43 of the combustion device 4 and the purge chambers 13, 14 of the furnace body 1 by a pipe 51, and an air supply blower 52, a flow rate adjustment valve 53, 54 and flow meters 55 and 56 are interposed.
The gas supply device 5, the flow rate of the combustion device 4, for example ^{40 m} 3 / Hr with suction, ^{10 m} 3 / Hr to the inlet purge chamber 13 by the flow control valve 53, a flow rate of ^{30 m} 3 / Hr into the outlet purge chamber 14 Then, it is distributed and supplied as a purge gas.
[0014]
As described above, the continuous heating furnace recirculates the gas generated by the combustion of the volatile matter discharged from the workpiece to the inlet purge chamber 13 and the outlet purge chamber 14, so that this gas can be reused as the purge gas. it can. For this reason, the purge gas supplied conventionally becomes unnecessary and the activation processing cost can be reduced. Further, since the gas generated in the combustion device 4 is recycled and reused without being directly discarded into the atmosphere, the environmental load can be reduced.
The continuous heating furnace of the present invention is not limited to the above-described embodiment, and various design changes such as using a roller conveyor or a pusher instead of the net conveyor as the transfer device 2 are performed. Can do.
[0015]
【The invention's effect】
As described above, according to the continuous heating furnace for activation treatment of the present invention, the gas obtained by burning the material volatilized from the workpiece is supplied to the inlet purge chamber and the outlet purge chamber, and circulated again as the purge gas. Since it can be utilized, the conventional purge gas supplied to the purge chamber becomes unnecessary, and the activation processing cost can be reduced correspondingly. In addition, since the gas generated in the combustion apparatus is recycled and reused without being directly discarded into the atmosphere, the environmental load can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of a continuous heating furnace according to the present invention.
FIG. 2 is a cross-sectional view showing an internal configuration of the continuous heating furnace.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Furnace 11 Heating chamber 12 Cooling chamber 13 Inlet purge chamber 14 Outlet purge chamber 2 Conveying device 3 Recovery device 4 Combustion device 5 Gas supply device

Claims (1)

A heating chamber for heating an object to be processed made of a carbonaceous material containing a volatile substance in a water vapor atmosphere, a cooling chamber for cooling the object to be processed heated in the heating chamber, and a loading side of the object to be processed in the heating chamber The inlet purge chamber provided in the cooling chamber, the outlet purge chamber provided on the workpiece discharge side of the cooling chamber, and the workpiece are sequentially transferred to the inlet purge chamber, heating chamber, cooling chamber, and outlet purge chamber. In a continuous heating furnace for activation treatment comprising a transport device,
A recovery device for recovering a substance volatilized from the object to be processed from the heating chamber to the outside of the furnace;
A combustion device for burning the recovered volatile substances;
A gas supply device for supplying gas generated in the combustion device to the inlet purge chamber and the outlet purge chamber,
A continuous heating furnace for activation treatment, wherein the gas generated in the combustion device is recycled and reused as purge gas without being directly discarded into the atmosphere.

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